使用相位拉伸变换的图像特征检测：PST或相位拉伸变换是在图像中查找特征的运算符。 使用MATLAB在此处实现的PST，将强度图像I作为其输入，并返回大小与I相同的二进制图像，其中1表示函数在I处发现尖锐过渡，而0表示在其他位置处存在尖锐过渡-源码

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